External drive won't boot after install?
I tried installing mountain lion onto an external SSD drive. At first it worked, using my USB install drive and selected my external drive as the target. All the files are copied over and asked me to restart. However, after restart all it did is booted back into my internal drive OSX. Even if I held down the option button it won't allow me to boot the external drive. Any ideas? I'm doing this from the retina macbook pro.